Read This! Reboot by Amy Tintera

Seventeen-year-old Wren was shot in the chest five years ago. After 178 minutes, she came back to life as a Reboot. She's strong, fast, and unemotional. The longer Reboots are dead, the less human they are, and Wren is the deadliest Reboot in the Republic of Texas, now serving as a soldier for the Human Advancement and Repopulation Corporation.

Part of Wren's job is to train new Reboots, and Callum is one of the worst she's ever worked with. Callum was only dead for 22 minutes before becoming a Reboot. He's practically still human - frustratingly slow, emotional, and always asking questions. But Callum makes Wren feel alive, so when she is ordered to eliminate Callum for failing to measure up, Wren decides to disobey.

Reboot is a fast-paced, thrilling dystopian story with a fascinating premise and just the right amount of romance. Pick this up while you're waiting for the last book in the Divergent trilogy - you won't be disappointed!